Repeating attachment for sound-reproducing machines



G. L. BULLOCK.

REPEATING ATTACHMENT FOR SOUND REPRODUCING MACHINES.

APPLICATION FILED JUNE 25, 1919.

1,405,751 Patented Feb. 7, 1922.

2 SHhETS-SHEET l- JYCT.

awwmtoz G. L. BULLOCK,

REPEATING ATTACHMENT FOR SOUND REPRODUCING MACHINES.

APPLICATION FILED 1UNE25, 1919.

1 ,405,751 Patented Feb. 7, 1922.

2 SHEETSSHEET Z.

MI LQ nwntoz UNITED STATES PATENT O'FFICE.

BEPEATING ATTACHMENT FOR SOUND-REPRODUCIN G MACHINES.

Application filed June 25, 1919.

tachmentfor Sound-Reproducing Machines,

of which the following is a specification.

This invention relates to repeating attachments for phonographs andother sound re producing machines. I

The primary object of the invention is to provide an efficient andgenerally improved mechanism for automatically returning the sound boxand stylus of the phonograph to its initial or starting pointaftercompletion of the record being played so that the playing will beautomatically repeated.

Another object of the invention resides in the provision of an electro-mechanicat mechanism for returning the reproducing stylus to itsstarting point and further in the specific construction and arrangementof such mechanism.

With these and other objects in view, reference will now be had to theaccompanying drawings, in which drawings Figure 1 is a side elevationalview showing the necessary parts of the phonograph and the manner ofattaching my invention thereto;

Figure 2 is a top lan view of the construction shown in igure 1, certainparts in this view being broken away to disclose other parts;

Figure 3 is a view similar to Figure 2 but showlng the sound box in adifferent position, and

Figure 4 is a side elevational view of the device as shown in Figure 3.

Referring to the drawings by numerals, l designates the turn table, 2the record, and 3 the centering post for the record carried by the turntable. The reproducing horn, sound box, and stylus are indicatedrespectively by the numerals 4:, 5, and 6.

In carrying out my invention, I provide, for attachment to the post 3, acontact 7. This contact as shown to advantage in Figure 2, is made froma single strip of suitable metal, either round or flat and preferablyresilient. This strip is bent as shown in Figure 2 to provide a straightarm portion 8 which extends transversely through the record post nearthe top of the latter, and a semi-circular curved portion 9 which isdisposed upon one part of the post as shown.

Specification of Letters Patent.

Patented Feb. 7, 1922. Serial No. 306,670.

Surrounding the reproducing horn 4 in spaced relation to one another area pair or split bands 10 and 11. The split ends of each of these bandsare disposed below the horn and secured to o posite sides of alongltudinally extending ar 12, the ends of the band 11 belng fastenedto one end of the bar and the ends of the band 10 to an intermediateportion.

Pivoted to the free or forward end of bar 12 is a vertical arm 13 of abell crank lever 14. The horizontal arm 15 of this lever extendsforwardly in a plane belowthat of the bar 12 and is provided at itsextremity with an enlarged head 16 for engagement with the sound box 5as will be later explained.

One end of a bar 17 extending diagonally to the bar 12 is secured as at18 to the upper end of the arm 13. The oppositeend of this bar 17 issecured to the lower endof a short vertical supporting arm 19, thelatter having its upper end pivoted to bar 12 as indicated at 20. Amagnetic coil 21=is supported by the arm 19 and has extendingtherethrough a core 22. At its upper end this core is provided with ahead 23 to which is attached one end of a coil spring 24. The oppositeend of this spring is attached to the bar 12. The magnetic coil 21 iselectrically connected with the bar 12 and with one pole of a battery25, the other pole of said battery'being connected, by a lead wire 26with the binding post 27 of the contact 28 engaging the under face oftheturn table 29.

As shown clearly in Figures 2, 3, and 4 of the drawings, the turn table1 is provided around its edge with a suitable cam surface 29. This camsurface extends around said edge for a distance of approximately onehalfof the circumference of the turn table and is composed preferably of asingle strip of suitable material secured to the turn table by means ofscrews 30 as shown.

In operation, when the record has been completed, the sound box- 5engages the. contact 7 thus closing the curcuit to the battery 25. Thecurrent passes from the battery through the contact 28, turn table 1,and record post 3 to the contact 7. From the contact 7 the currentreturns to the battery ion through the sound box, reproducing horn,

core 23 thus lowering the lower end of this core into engagement withthe cam surface 29 of the turn table. As this cam surface revolves pastthe lower end of the solenoid it forces the latter to swing outwardlywith the supporting post 19, as shown in Figure 4, until the enlargedportion 16 of the arm 17 engages the sound box 5 and lifts thereproducer and stylus 6 out of engagement with the record. \Vhen thishas been accomplished, further outward movement of the solenoid in thisdirection is prevented and its frictional engagement with the cam 29 issuch that the core will revolve with the same, carrying with it thereproducing horn and sound box and thus returning the stylus to itsstarting point. lVhen the stylus has been returned to its starting pointthe thickest portion, of the cam Will be permitted to pass beyohd thecore without causing further movement of the latter and the gradualdecreasing thickness or slope of the cam will permit the stylus to begradually lowered to the record so that playing of the record will againbe repeated. As the circuit to the battery is broken at the time thestylus is again lowered to the record, the spring 24 will withdraw thelower end of the solenoid 22 from engagement with the cam 29 until thesound box 5 again engages the contact 7 upon completion of the record.

Having thus fully described my invention, I claim:

1. In a phonograph having a. turntable, a tone arm, and sound box, arepeating attachmentincluding a cam member carried by the turntable,lifting means carried by the tone arm for engagement with the sound boxto lift the stylus out of engagement with a record after playing of thelatter has been completed and return said stylus to its starting point,and electrical means for automatically establishing connection betweenthe cam member and lifting means to provide for the operation of thelatter.

2. In a phonograph having a turntable, a, tone arm, and sound box, arepeating attachment including a cam member attached to and revolvingwith said turntable, lifting mechanism carried by the tone arm andengageable with the sound box of the machine to raise the stylus out ofengagement with the record and return said stylus to its starting point,a magnetic coil carried by said lifting means, a core controlled by saidcoil adapted upon the closing of an electrical circuit to be broughtintoengagement with said cam arm to set the lifting means intooperation.

3. In-a phonograph having a turntable, tone arm', and sound box, arepeating attachment com rising a cam member, carried by the turntable,a bar suspended from the tone arm, a bell crank lever pivoted to theforward end of said bar and having one arm thereof disposed forengagement with the sound box to lift the stylus from the record uponcompletion of the latter, a second bar connected at one end to the otherarm of said bell crank lever, a magnetic coil pivotally suspended fromsaid first bar and having pivotal connection with the other end of saidsecond bar, and a core controlled by said coil and adapted at times tobe lowered into engagement with said cam member to set said liftingmechanism into operation to return the stylus to the starting point.

4. In a phonograph having a turntable, tone arm, and sound box, arepeating attachment comprising a cam member carried by the turntable, alongitudinally extending bar suspended from the tone arm, a bell cranklever pivoted to one end of said bar and having one of its ends disposedfor engagement with the sound box to lift the stylus out of engagementwith the record and to return said stylus to its starting point, asecond bar pivotally suspended from said first bar, a connection betweenthe lower end of said second bar and the other arm of said lever, amagnetic coil carried by said second bar, a core controlled by said coiland resiliently suspended from said first bar, a contact supported abovethe turntable of the machine, said core being adapted upon the closingof an electrical circuit to engage said cam member thereby setting saidlifting mechanism into operation.

In a phonograph having a turntable, tone arm, and sound box, a repeatingattachment comprising a cam member carried by the turntable, a contactcarried by the center post of said turntable, a bar suspended from thetone arm, a bell crank lever pivoted to one end of the said bar andhaving one arm disposed for engagement with the sound box to'raise thereproducing stylus out of engagement. with the record upon completion ofthe latter, a magnetic coil pivotally suspended from said bar, anoperating connection between said coil and the other end of said cranklever, a core controlled by-said coil adapted at times to be loweredinto engagement with said cam member to raise the reproducing stylus outof engagement with the record by means of said bell crank lever and toreturn said stylus to its starting point.

In testimony whereof, I have affixed my signature in the presence of twowitnesses.

GEORGE L. BULLOCK.

Witnesses:

Bnssm L. SHEABER, J. L. PEARSON.

